Hafi ya TPU

Hafi ya TPUni Ubwoko bwathermoplastique polyurethane elastomer. Intangiriro yicyongereza niyi ikurikira:

### Ibigize hamwe na Synthesis Polyether ishingiye kuri TPU ikomatanyirizwa cyane cyane kuva 4,4′-diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), na 1,4-butanediol (BDO). Muri byo, MDI itanga imiterere ihamye, PTMEG igizwe nigice cyoroshye kugirango itange ibikoresho byoroshye, kandi BDO ikora nk'iyagura urunigi kugirango yongere uburebure bwa molekile. Uburyo bwa synthesis ni uko MDI na PTMEG babanza kwitwara kugirango babe prepolymer, hanyuma prepolymer ikagira reaction yo kwagura urunigi hamwe na BDO, hanyuma, TPU ishingiye kuri polyether ikorwa nigikorwa cya catalizator.

# ##

### Ibyiza byo gukora -

** Indashyikirwa nziza ya Hydrolysis **: Inkunga ya polyether (-O-) ifite imiti ihanitse cyane kuruta polyester (-COO-), kandi ntabwo byoroshye kumeneka no gutesha agaciro mumazi cyangwa ahantu hashyushye nubushuhe. Kurugero, mugupimisha igihe kirekire kuri 80 ° C na 95% ugereranije nubushuhe bugereranije, igipimo cyingufu zo kugumana imbaraga, TPU ishingiye kuri polyether, irenga 85%, kandi nta kugabanuka kugaragara kugipimo cyo gukira cyoroshye. - ** Ibyiza byo hasi-Ubushyuhe Bwiza **: Ubushyuhe bwikirahure (Tg) bwigice cya polyether buri hasi (mubisanzwe munsi ya -50 ° C), bivuze koishingiye kuri TPUirashobora gukomeza kugumya guhinduka no guhinduka mubushyuhe buke. Mu kizamini cya -40 ° C ubushyuhe buke, nta kintu na kimwe cyacitse, kandi itandukaniro ryimikorere iva kumiterere yubushyuhe busanzwe ntabwo iri munsi ya 10%. - ** Kurwanya Imiti Nziza Kurwanya no Kurwanya Microbial **:Hafi ya TPUifite kwihanganira neza kumashanyarazi menshi (nka alcool, Ethylene glycol, acide nkeya hamwe nigisubizo cya alkali), kandi ntizabyimba cyangwa ngo ishonga. Byongeye kandi, igice cya polyether ntigishobora kubora byoroshye na mikorobe (nk'ibumba na bagiteri), bityo irashobora kwirinda kunanirwa imikorere iterwa n'isuri ya mikorobe iyo ikoreshejwe mubutaka butose cyangwa ibidukikije byamazi. . Ntabwo igumana gusa ibintu bisanzwe byoroshye kandi byoroshye bya TPU, ariko kandi ifite imbaraga zihagije zubaka, kandi irashobora kugera kuburinganire hagati y "gukira kwa elastique" n "imiterere ihamye". Imbaraga zacyo zirashobora kugera kuri 28MPa, kurambura kuruhuka kurenga 500%, naho amarira ni 60kN / m.

### Gusaba Imirima ya Polyether ishingiye kuri TPU ikoreshwa cyane mubice nko kuvura, imodoka, no hanze. Mu rwego rwubuvuzi, irashobora gukoreshwa mugukora catheters yubuvuzi bitewe nubuzima bwiza bwa biocompatibilité, hydrolysis irwanya mikorobe. Mu murima wimodoka, irashobora gukoreshwa mumashanyarazi ya moteri, kashe yumuryango, nibindi kubera ubushobozi bwayo bwo guhangana nubushyuhe bwo hejuru nubushuhe bwikirere, ubushyuhe buke bwubushyuhe hamwe na ozone. Mu murima wo hanze, birakwiriye gukora ibyuma bitarinda amazi hanze, ahantu hafite ubushyuhe buke, nibindi.